2 - y - 12*y + 11
-y^2 - 12*y + 11
/ ____\ / ____\ \x + 6 - \/ 47 /*\x + 6 + \/ 47 /
(x + 6 - sqrt(47))*(x + 6 + sqrt(47))
2 11 - y - 12*y
11 - y^2 - 12*y
11.0 - y^2 - 12.0*y
11 + y*(-12 - y)